In the wake of the 1987 crash, which also became known as Black Monday, markets around the world were put on restricted trading mainly because at the time computers were dealing with so many orders that they were unable to keep up.

By the end of October, stock markets in Australia had fallen by 41.8%, Hong Kong 45.8% and the United Kingdom 26.4%.

The effects of the crash were not as crippling as expected because it was not followed by a depression.

Over the next decade interest rates went down and investors showed new faith in the market.

The debate over the cause of the crash continued for many years after the event but economists have never been able to name a single factor that ushered in Black Monday.